The site is primarily focused on micro libraries, utilities, and other wizardry that can run in a browser.
The site is not focused on jQuery plugins, for that seehttp://plugins.jquery.com/.
The site is not an automated directory.
The site owner reads all the documentation and attempts to write an example that runs in the browser for every single library added to the site.
This all takes time and is motivated by a deep and possibly unhealthy love of HTML, Javascript, and CSS.